1. Pay-off is an indispensable process in the construction site, which must be paid attention to and mastered.

pile connection, together with the owner or local surveying and mapping unit, hand over the standard leveling points, positioning piles and red line piles on site one by one.

pay-off, at least one building, datum control line and one building datum elevation control point shall be put on the site, and piles shall be nailed and protected where foundation excavation does not affect it.

Take the datum control line as the standard, put each axis according to the drawing size, and nail piles on the extension lines at both ends of the axis.

according to the axis and construction space, set the excavation control line (slope top and toe line).

after the foundation pit is dug, put the bottom edge and nail the elevation control pile.

after the bottom plate is finished, put all axes on the bottom plate, pop up the wall contour line and the position line of doors and windows, and erect the elevation control rod.

after the roof is finished, put various axes on the roof, pop up the wall contour line and the position line of windows and doors, and erect the elevation control lever.

1 after the building positioning piles are set, the professional surveyors of the construction unit, the person in charge of the construction site and the supervisor will jointly pay off and recheck the foundation works.

2 set out all the positioning piles of the building axis (the axis can be set out at intervals according to the size of the building), and all the positioning piles of the axis are set out according to the positioning piles (at least 4) of the planning department and the construction plan of the building bottom. Pay-off tool is "theodolite".

3 generally, the setting-out of gantry plate positioning ruler is divided into measuring setting-out and instrument measuring setting-out. In the former, according to drawings, known control points or control points determined on site, the gantry plate is erected at a certain distance around the foundation of the building to be set, and a large right-angle line is drawn on the gantry plate with construction line, and the line is tightened as much as possible, and then the steel ruler is combined with Pythagorean theorem, and the size is larger, generally 6, 8 and 11 meters.